<template>
  <view class="search-container">
    <view class="search-box">
      <!-- 使用 uni-ui 提供的搜索组件 -->
      <uni-search-bar
        @input="input"
        :radius="100"
        cancelButton="none"
      ></uni-search-bar>
      <!-- 搜索建议列表 -->
      <view class="sugg-list" v-if="searchResults.length > 0">
        <navigator
          v-for="item in searchResults"
          class="sugg-item"
          :key="item.goods_id"
          :url="'/subpkg/goods_detail/index?goods_id=' + item.goods_id"
        >
          <text class="goods-name">{{ item.goods_name }}</text>
        </navigator>
      </view>
      <!-- 搜索历史 -->
      <view v-else class="history-box">
        <view class="history-title">
          <text>搜索历史</text>
          <uni-icons type="trash" size="17" @click="clearHistory"></uni-icons>
        </view>
        <!-- 列表区域 -->
        <view class="history-list">
          <uni-tag
            v-for="item in historys"
            :key="item"
            :text="item"
            @click="goToGoodsList(item)"
          ></uni-tag>
        </view>
      </view>
    </view>
  </view>
</template>

<script>
export default {
  data () {
    return {
      timer: null, // 防抖用的定时器
      keyword: '', // 搜索关键字
      // 搜索结果列表
      searchResults: [],
      // 搜索关键词的历史记录
      historyList: []
    }
  },
  onLoad () {
    this.historyList = uni.getStorageSync('history') || []
  },
  computed: {
    historys () {
      return [...this.historyList].reverse()
    }
  },
  methods: {
    input (e) {
      // 清除 timer 对应的延时器
      clearTimeout(this.timer)

      // 重新启动一个延时器，并把 timerId 赋值给 this.timer
      this.timer = setTimeout(() => {
        console.log(e)
        // 如果 500 毫秒内，没有触发新的输入事件，则为搜索关键词赋值
        this.keyword = e

        this.search()
      }, 1000)
    },
    async search () {
      if (this.keyword.trim() === '') {
        this.searchResults = []
        return
      }

      const res = await uni.$request({
        url: '/api/public/v1/goods/qsearch',
        data: {
          query: this.keyword
        }
      })

      if (res.meta.status === 200) {
        this.searchResults = res.message

        // 保存搜索结果
        this.saveSearchHistory(this.keyword)
      }
    },
    saveSearchHistory (keyword) {
      // 去重保存
      const historyList = new Set(this.historyList)
      // 先把之前存在的删除掉
      historyList.delete(keyword)
      // 再保存进去
      historyList.add(keyword)
      // 把它赋值给historyList
      this.historyList = Array.from(historyList)
      // 保存到本地
      uni.setStorageSync('history', this.historyList)
    },
    clearHistory () {
      this.historyList = []
      uni.setStorageSync('history', [])
    },
    // 跳转到商品列表
    goToGoodsList (item) {
      uni.navigateTo({
        url: '/subpkg/goods_list/index?query=' + item
      })
    }
  }
}
</script>

<style lang="scss" scoped>
.search-container {
  .search-box {
    position: sticky;
    top: 0;
    z-index: 999;
    ::v-deep .uni-searchbar {
      /* #ifndef APP-NVUE */
      display: flex;
      /* #endif */
      flex-direction: row;
      position: relative;
      padding: 16rpx;
      /* 将默认的 #FFFFFF 改为 #C00000 */
      background-color: #c00000;
    }

    .history-box {
      padding: 0 5px;

      .history-title {
        display: flex;
        justify-content: space-between;
        align-items: center;
        height: 40px;
        font-size: 13px;
        border-bottom: 1px solid #efefef;
      }

      .history-list {
        display: flex;
        flex-wrap: wrap;

        ::v-deep .uni-tag {
          margin-top: 5px;
          margin-right: 5px;
        }
      }
    }

    .sugg-list {
      padding: 0 5px;

      .sugg-item {
        font-size: 12px;
        padding: 13px 0;
        border-bottom: 1px solid #efefef;
        display: flex;
        align-items: center;
        justify-content: space-between;

        .goods-name {
          // 文字不允许换行（单行文本）
          white-space: nowrap;
          // 溢出部分隐藏
          overflow: hidden;
          // 文本溢出后，使用 ... 代替
          text-overflow: ellipsis;
          margin-right: 3px;
        }
      }
    }
  }
}
</style>
